The primary "deep feature" of Binding of Isaac Unblocked No Flash versions is their migration to modern web technologies like WebAssembly
If you are old enough to remember the original Flash Isaac, you remember the . When you got too many tears on screen (Brimstone + Homing + Triple Shot), the game would slow to a crawl. That was because Flash was single-threaded and inefficient. Binding Of Isaac Unblocked No Flash